4DM8

Crystal structure of RARb LBD in complex with 9cis retinoic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Structural basis for a molecular allosteric control mechanism of cofactor binding to nuclear receptors.

Osz, J.Brelivet, Y.Peluso-Iltis, C.Cura, V.Eiler, S.Ruff, M.Bourguet, W.Rochel, N.Moras, D.

(2012) Proc Natl Acad Sci U S A 109: E588-E594

  • DOI: https://doi.org/10.1073/pnas.1118192109
  • Primary Citation of Related Structures:  
    4DM6, 4DM8, 4DMA

  • PubMed Abstract: 

    Transcription regulation by steroid hormones, vitamin derivatives, and metabolites is mediated by nuclear receptors (NRs), which play an important role in ligand-dependent gene expression and human health. NRs function as homodimers or heterodimers and are involved in a combinatorial, coordinated and sequentially orchestrated exchange between coregulators (corepressors, coactivators). The architecture of DNA-bound functional dimers positions the coregulators proteins. We previously demonstrated that retinoic acid (RAR-RXR) and vitamin D3 receptors (VDR-RXR) heterodimers recruit only one coactivator molecule asymmetrically without steric hindrance for the binding of a second cofactor. We now address the problem of homodimers for which the presence of two identical targets enhances the functional importance of the mode of binding. Using structural and biophysical methods and RAR as a model, we could dissect the molecular mechanism of coactivator recruitment to homodimers. Our study reveals an allosteric mechanism whereby binding of a coactivator promotes formation of nonsymmetrical RAR homodimers with a 21 stoichiometry. Ligand conformation and the cofactor binding site of the unbound receptor are affected through the dimer interface. A similar control mechanism is observed with estrogen receptor (ER) thus validating the negative cooperativity model for an established functional homodimer. Correlation with published data on other NRs confirms the general character of this regulatory pathway.


  • Organizational Affiliation

    Institut National de Santé et de Recherche Médicale U964/Centre National de Recherche Scientifique, Unité Mixte de Recherche 7104/Université de Strasbourg, 67404 Illkirch, France.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Retinoic acid receptor beta
A, B
267Homo sapiensMutation(s): 0 
Gene Names: RARBHAPNR1B2
UniProt & NIH Common Fund Data Resources
Find proteins for P10826 (Homo sapiens)
Explore P10826 
Go to UniProtKB:  P10826
PHAROS:  P10826
GTEx:  ENSG00000077092 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10826
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nuclear receptor coactivator 1
C, D
25Homo sapiensMutation(s): 0 
EC: 2.3.1.48
UniProt & NIH Common Fund Data Resources
Find proteins for Q15788 (Homo sapiens)
Explore Q15788 
Go to UniProtKB:  Q15788
PHAROS:  Q15788
GTEx:  ENSG00000084676 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15788
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.224 
  • R-Value Observed: 0.224 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.482α = 90
b = 83.622β = 90
c = 108.779γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
AMoREphasing
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-03-07
    Type: Initial release
  • Version 1.1: 2012-05-16
    Changes: Database references
  • Version 1.2: 2016-11-16
    Changes: Non-polymer description
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Derived calculations